Vacuum-pump



(No Model.)

A. BERRENBERG & W. E. NICKERSON.

VACUUM PUMP.

No. 447,273. Patented Feb. 24, 1891.

@ZZZQQ ms mums PETERS cm, PHOTO LITMO., WASHINGTON, o. c

UNITED STATES PATENT OFFICE.

ADOLPH BERRENBERG, OF SOMERVILLE, AND IVILLIAM E..NICKERSON, OF CAMBRIDGE, MASSACHUSETTS, ASSIGNORS TO THE BEACON VACUUM PUMP AND ELECTRICAL COMPANY, OF PORTLAND, MAINE.

VACUUM-PUMP.

SPECIFICATION forming part of Letters Patent No. 447,273, dated February 24, 1891.

Application filed May 10,1890. Serial No. 351358. (No model.)

To aZZ whom it may concern.-

Be it known that we, ADOLPH BERRENBERG, of Somerville, and WILLIAM E. NIOKERSON, of Cambridge, both in the county of Middlesex and State of Massachusetts, have invented a new and useful Improvement in Vacuum-Pumps, of which the following, taken in connection with the accompanying drawings, is a specification.

This invention consists in using as a sealing medium for the jacketing-spaces about a vacuum-pump cylinder and its connections a liquid deprived of air or other gaseous or volatile bodies.

This invention may be put in practice by a great variety of devices, one of which is shown in the accompanying drawings, in which the parts are shown partly in section and partly in elevation, the illustration being intended to be as far diagrammatical as is consistent with a clear understanding of the method.

In the illustration, A represents the inner cylinder of a vacuum-pump, and A the jacketing-cylinder. The space S between the two cylinders is closed at all points, so that no air can enter it.

B represents the bottom of the cylinder proper, and B the bottom of the jacketingcylinder.

The valves used in this illustration consist of a valve D, serving to admit air from the chamber being exhausted, and of a valve E, through which the air is to be expelled. The above-described valves are not operated by the pressure of the air, but should be provided with mechanisms which will cause them to act independently of the air and at such times'as the best action of the pump requires.

I will now describe an oil-supply device. M is a reservoir for oil located above the spaces in and about the pump, so that the oil will flow by its gravity unless checked from the reservoir to the spaces to be sealed. This In the illustration an auxiliary air-pump M is shown immediately over the oil-reservoir M.- The cylinder of this pump M hasa valve, as shown at M and a piston N, also provided with a valve.

The mode of operation involved in this illustrative device is as follows: The oil or other fluid to be used is placed in the reservoir M, thence made to fill the circulationpipes and spaces S S S of the vacuum-pump to be sealed. Now if we start the apparatus the oil in the. reservoir M will be subjected to avacuum and its embodied air will expand and rapidly leave it in a deaerated con dition, as the movements go on all of the oil in the circulation-pipe and in the sealing parts will become deaerated to such a degree that no more air can be drawn from the oil, and thus the oil becomes a medium properly adapted for the purpose of sealing. If the oil in its circulation becomes from any cause reaerated, as it readily absorbs air when brought in contact 'with it, it is again restored to its airless condition by the continued action'of the vacuum in reservoir M.

This invention does not depend upon the mechanism by which it is put in practice,

but upon the use of deaerated oil for a sealing medium, thereby making a vacuum-pump more efficient than has heretofore been done.

It is well-known that satisfactory vacuums have been produced by means of mercurypumps, but they are extremely and necessarily slow.

The method above described admits of using large pumps, the functional parts of which may move rapidly, so that it becomes possible to exhaust on a large scale. For example, if the pump is applied to the work of exhausting electric incandescent lamps, hundreds may be exhausted at one operation and in a very short time.

In the above description and accompanying drawings parts not claimed in this application are described and shown that are also described and shown in application (of even date, Serial N 0. 351,359) filed by us in the United States Patent OfiEice.

We claim- 7 1. In the jacketing-spaces of a vacuumpump, deaerated oil as asealing medium, sub- I operating substaritially as and for the purstantially as and for the purpose set forth. pose set forth.

2. In a vacuum-pump, the combination of ADOLPH BERRENBERG. jaeketing-spaces sealed with deaerated oil, XVILLIAM E. NIOKERSON. 5 and an apparatus having passage-connection \Vitnesses:

with said spaces and adapted to deaemte the FRANK G. PARKER,

oil and force it through the jacketing-spaces, WILLIAM SEARS. V 

